Improvement in air-engines



y STILLMAN.

AIR ENGINE. 'Patented June 26, 1860.-

Ameans of causing a circulation of air. in contact with the moist surfaces might be usedsuch as a common bellows or a fan-blowerwithout altering the nature of my invention..

In my method of cooling only a small portion of the power of the engine is consumed in moving the air, and by reason of the velocity of air actively forced and the rapidity of the'evaporation the heat may be conveyed away very rapidly with a much smaller quan` tity of Water than by any means previously known for this purpose.

By my arrangement or the refrigeratingl vessel relatively to the other parts the air is blown by the 'ecp'rocation ot' the Vessel O, mounted directly upon the piston-rod, thus greatly simplifying the mechanism of the engine.

. I am aware that evaporation from moist .surfaces has often been used for cooling different substances; ,but I amnot aware that'the .surfaces of a refrigerator for air-engines have been inoistened and a blast of air forced by. the working of the engine to circulate 1n contact therewith for increasing the evaporation, and

l therefore claim as my 1nventionl. Using a portion of the power of an air- 

